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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
*/
#include <common.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/pinctrl.h>
#include <asm/io.h>
#include <asm-generic/gpio.h>
#include <linux/bitops.h>
#include "pinctrl-mtk-common.h"
#if CONFIG_IS_ENABLED(PINCONF)
/**
* struct mtk_drive_desc - the structure that holds the information
* of the driving current
* @min: the minimum current of this group
* @max: the maximum current of this group
* @step: the step current of this group
* @scal: the weight factor
*
* formula: output = ((input) / step - 1) * scal
*/
struct mtk_drive_desc {
u8 min;
u8 max;
u8 step;
u8 scal;
};
/* The groups of drive strength */
static const struct mtk_drive_desc mtk_drive[] = {
[DRV_GRP0] = { 4, 16, 4, 1 },
[DRV_GRP1] = { 4, 16, 4, 2 },
[DRV_GRP2] = { 2, 8, 2, 1 },
[DRV_GRP3] = { 2, 8, 2, 2 },
[DRV_GRP4] = { 2, 16, 2, 1 },
};
#endif
static const char *mtk_pinctrl_dummy_name = "_dummy";
static void mtk_w32(struct udevice *dev, u32 reg, u32 val)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
__raw_writel(val, priv->base + reg);
}
static u32 mtk_r32(struct udevice *dev, u32 reg)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
return __raw_readl(priv->base + reg);
}
static inline int get_count_order(unsigned int count)
{
int order;
order = fls(count) - 1;
if (count & (count - 1))
order++;
return order;
}
void mtk_rmw(struct udevice *dev, u32 reg, u32 mask, u32 set)
{
u32 val;
val = mtk_r32(dev, reg);
val &= ~mask;
val |= set;
mtk_w32(dev, reg, val);
}
static int mtk_hw_pin_field_lookup(struct udevice *dev, int pin,
const struct mtk_pin_reg_calc *rc,
struct mtk_pin_field *pfd)
{
const struct mtk_pin_field_calc *c, *e;
u32 bits;
c = rc->range;
e = c + rc->nranges;
while (c < e) {
if (pin >= c->s_pin && pin <= c->e_pin)
break;
c++;
}
if (c >= e)
return -EINVAL;
/* Calculated bits as the overall offset the pin is located at,
* if c->fixed is held, that determines the all the pins in the
* range use the same field with the s_pin.
*/
bits = c->fixed ? c->s_bit : c->s_bit + (pin - c->s_pin) * (c->x_bits);
/* Fill pfd from bits. For example 32-bit register applied is assumed
* when c->sz_reg is equal to 32.
*/
pfd->offset = c->s_addr + c->x_addrs * (bits / c->sz_reg);
pfd->bitpos = bits % c->sz_reg;
pfd->mask = (1 << c->x_bits) - 1;
/* pfd->next is used for indicating that bit wrapping-around happens
* which requires the manipulation for bit 0 starting in the next
* register to form the complete field read/write.
*/
pfd->next = pfd->bitpos + c->x_bits > c->sz_reg ? c->x_addrs : 0;
return 0;
}
static int mtk_hw_pin_field_get(struct udevice *dev, int pin,
int field, struct mtk_pin_field *pfd)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
const struct mtk_pin_reg_calc *rc;
if (field < 0 || field >= PINCTRL_PIN_REG_MAX)
return -EINVAL;
if (priv->soc->reg_cal && priv->soc->reg_cal[field].range)
rc = &priv->soc->reg_cal[field];
else
return -EINVAL;
return mtk_hw_pin_field_lookup(dev, pin, rc, pfd);
}
static void mtk_hw_bits_part(struct mtk_pin_field *pf, int *h, int *l)
{
*l = 32 - pf->bitpos;
*h = get_count_order(pf->mask) - *l;
}
static void mtk_hw_write_cross_field(struct udevice *dev,
struct mtk_pin_field *pf, int value)
{
int nbits_l, nbits_h;
mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
mtk_rmw(dev, pf->offset, pf->mask << pf->bitpos,
(value & pf->mask) << pf->bitpos);
mtk_rmw(dev, pf->offset + pf->next, BIT(nbits_h) - 1,
(value & pf->mask) >> nbits_l);
}
static void mtk_hw_read_cross_field(struct udevice *dev,
struct mtk_pin_field *pf, int *value)
{
int nbits_l, nbits_h, h, l;
mtk_hw_bits_part(pf, &nbits_h, &nbits_l);
l = (mtk_r32(dev, pf->offset) >> pf->bitpos) & (BIT(nbits_l) - 1);
h = (mtk_r32(dev, pf->offset + pf->next)) & (BIT(nbits_h) - 1);
*value = (h << nbits_l) | l;
}
static int mtk_hw_set_value(struct udevice *dev, int pin, int field,
int value)
{
struct mtk_pin_field pf;
int err;
err = mtk_hw_pin_field_get(dev, pin, field, &pf);
if (err)
return err;
if (!pf.next)
mtk_rmw(dev, pf.offset, pf.mask << pf.bitpos,
(value & pf.mask) << pf.bitpos);
else
mtk_hw_write_cross_field(dev, &pf, value);
return 0;
}
static int mtk_hw_get_value(struct udevice *dev, int pin, int field,
int *value)
{
struct mtk_pin_field pf;
int err;
err = mtk_hw_pin_field_get(dev, pin, field, &pf);
if (err)
return err;
if (!pf.next)
*value = (mtk_r32(dev, pf.offset) >> pf.bitpos) & pf.mask;
else
mtk_hw_read_cross_field(dev, &pf, value);
return 0;
}
static int mtk_get_groups_count(struct udevice *dev)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
return priv->soc->ngrps;
}
static const char *mtk_get_pin_name(struct udevice *dev,
unsigned int selector)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
if (!priv->soc->grps[selector].name)
return mtk_pinctrl_dummy_name;
return priv->soc->pins[selector].name;
}
static int mtk_get_pins_count(struct udevice *dev)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
return priv->soc->npins;
}
static const char *mtk_get_group_name(struct udevice *dev,
unsigned int selector)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
if (!priv->soc->grps[selector].name)
return mtk_pinctrl_dummy_name;
return priv->soc->grps[selector].name;
}
static int mtk_get_functions_count(struct udevice *dev)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
return priv->soc->nfuncs;
}
static const char *mtk_get_function_name(struct udevice *dev,
unsigned int selector)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
if (!priv->soc->funcs[selector].name)
return mtk_pinctrl_dummy_name;
return priv->soc->funcs[selector].name;
}
static int mtk_pinmux_group_set(struct udevice *dev,
unsigned int group_selector,
unsigned int func_selector)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
const struct mtk_group_desc *grp =
&priv->soc->grps[group_selector];
int i;
for (i = 0; i < grp->num_pins; i++) {
int *pin_modes = grp->data;
mtk_hw_set_value(dev, grp->pins[i], PINCTRL_PIN_REG_MODE,
pin_modes[i]);
}
return 0;
}
#if CONFIG_IS_ENABLED(PINCONF)
static const struct pinconf_param mtk_conf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
{ "output-high", PIN_CONFIG_OUTPUT, 1, },
{ "output-low", PIN_CONFIG_OUTPUT, 0, },
{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
};
int mtk_pinconf_bias_set_v0(struct udevice *dev, u32 pin, u32 arg)
{
int err, disable, pullup;
disable = (arg == PIN_CONFIG_BIAS_DISABLE);
pullup = (arg == PIN_CONFIG_BIAS_PULL_UP);
if (disable) {
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PU, 0);
if (err)
return err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PD, 0);
if (err)
return err;
} else {
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PU, pullup);
if (err)
return err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PD, !pullup);
if (err)
return err;
}
return 0;
}
int mtk_pinconf_bias_set_v1(struct udevice *dev, u32 pin, u32 arg)
{
int err, disable, pullup;
disable = (arg == PIN_CONFIG_BIAS_DISABLE);
pullup = (arg == PIN_CONFIG_BIAS_PULL_UP);
if (disable) {
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PULLEN, 0);
if (err)
return err;
} else {
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PULLEN, 1);
if (err)
return err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PULLSEL,
pullup);
if (err)
return err;
}
return 0;
}
int mtk_pinconf_input_enable_v1(struct udevice *dev, u32 pin, u32 arg)
{
int err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_IES, 1);
if (err)
return err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 0);
if (err)
return err;
return 0;
}
int mtk_pinconf_drive_set_v0(struct udevice *dev, u32 pin, u32 arg)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
const struct mtk_pin_desc *desc = &priv->soc->pins[pin];
const struct mtk_drive_desc *tb;
int err = -ENOTSUPP;
tb = &mtk_drive[desc->drv_n];
/* 4mA when (e8, e4) = (0, 0)
* 8mA when (e8, e4) = (0, 1)
* 12mA when (e8, e4) = (1, 0)
* 16mA when (e8, e4) = (1, 1)
*/
if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
arg = (arg / tb->step - 1) * tb->scal;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_E4,
arg & 0x1);
if (err)
return err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_E8,
(arg & 0x2) >> 1);
if (err)
return err;
}
return 0;
}
int mtk_pinconf_drive_set_v1(struct udevice *dev, u32 pin, u32 arg)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
const struct mtk_pin_desc *desc = &priv->soc->pins[pin];
const struct mtk_drive_desc *tb;
int err = -ENOTSUPP;
tb = &mtk_drive[desc->drv_n];
if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
arg = (arg / tb->step - 1) * tb->scal;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DRV, arg);
if (err)
return err;
}
return 0;
}
static int mtk_pinconf_set(struct udevice *dev, unsigned int pin,
unsigned int param, unsigned int arg)
{
int err = 0;
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
int rev = priv->soc->rev;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
if (rev == MTK_PINCTRL_V0)
err = mtk_pinconf_bias_set_v0(dev, pin, param);
else
err = mtk_pinconf_bias_set_v1(dev, pin, param);
if (err)
goto err;
break;
case PIN_CONFIG_OUTPUT_ENABLE:
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_SMT, 0);
if (err)
goto err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 1);
if (err)
goto err;
break;
case PIN_CONFIG_INPUT_ENABLE:
if (rev == MTK_PINCTRL_V1)
err = mtk_pinconf_input_enable_v1(dev, pin, param);
if (err)
goto err;
break;
case PIN_CONFIG_OUTPUT:
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR, 1);
if (err)
goto err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DO, arg);
if (err)
goto err;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
/* arg = 1: Input mode & SMT enable ;
* arg = 0: Output mode & SMT disable
*/
arg = arg ? 2 : 1;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_DIR,
arg & 1);
if (err)
goto err;
err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_SMT,
!!(arg & 2));
if (err)
goto err;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
if (rev == MTK_PINCTRL_V0)
err = mtk_pinconf_drive_set_v0(dev, pin, arg);
else
err = mtk_pinconf_drive_set_v1(dev, pin, arg);
if (err)
goto err;
break;
default:
err = -ENOTSUPP;
}
err:
return err;
}
static int mtk_pinconf_group_set(struct udevice *dev,
unsigned int group_selector,
unsigned int param, unsigned int arg)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
const struct mtk_group_desc *grp =
&priv->soc->grps[group_selector];
int i, ret;
for (i = 0; i < grp->num_pins; i++) {
ret = mtk_pinconf_set(dev, grp->pins[i], param, arg);
if (ret)
return ret;
}
return 0;
}
#endif
const struct pinctrl_ops mtk_pinctrl_ops = {
.get_pins_count = mtk_get_pins_count,
.get_pin_name = mtk_get_pin_name,
.get_groups_count = mtk_get_groups_count,
.get_group_name = mtk_get_group_name,
.get_functions_count = mtk_get_functions_count,
.get_function_name = mtk_get_function_name,
.pinmux_group_set = mtk_pinmux_group_set,
#if CONFIG_IS_ENABLED(PINCONF)
.pinconf_num_params = ARRAY_SIZE(mtk_conf_params),
.pinconf_params = mtk_conf_params,
.pinconf_set = mtk_pinconf_set,
.pinconf_group_set = mtk_pinconf_group_set,
#endif
.set_state = pinctrl_generic_set_state,
};
static int mtk_gpio_get(struct udevice *dev, unsigned int off)
{
int val, err;
err = mtk_hw_get_value(dev->parent, off, PINCTRL_PIN_REG_DI, &val);
if (err)
return err;
return !!val;
}
static int mtk_gpio_set(struct udevice *dev, unsigned int off, int val)
{
return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DO, !!val);
}
static int mtk_gpio_get_direction(struct udevice *dev, unsigned int off)
{
int val, err;
err = mtk_hw_get_value(dev->parent, off, PINCTRL_PIN_REG_DIR, &val);
if (err)
return err;
return val ? GPIOF_OUTPUT : GPIOF_INPUT;
}
static int mtk_gpio_direction_input(struct udevice *dev, unsigned int off)
{
return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DIR, 0);
}
static int mtk_gpio_direction_output(struct udevice *dev,
unsigned int off, int val)
{
mtk_gpio_set(dev, off, val);
/* And set the requested value */
return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_DIR, 1);
}
static int mtk_gpio_request(struct udevice *dev, unsigned int off,
const char *label)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev->parent);
return mtk_hw_set_value(dev->parent, off, PINCTRL_PIN_REG_MODE,
priv->soc->gpio_mode);
}
static int mtk_gpio_probe(struct udevice *dev)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev->parent);
struct gpio_dev_priv *uc_priv;
uc_priv = dev_get_uclass_priv(dev);
uc_priv->bank_name = priv->soc->name;
uc_priv->gpio_count = priv->soc->npins;
return 0;
}
static const struct dm_gpio_ops mtk_gpio_ops = {
.request = mtk_gpio_request,
.set_value = mtk_gpio_set,
.get_value = mtk_gpio_get,
.get_function = mtk_gpio_get_direction,
.direction_input = mtk_gpio_direction_input,
.direction_output = mtk_gpio_direction_output,
};
static struct driver mtk_gpio_driver = {
.name = "mediatek_gpio",
.id = UCLASS_GPIO,
.probe = mtk_gpio_probe,
.ops = &mtk_gpio_ops,
};
static int mtk_gpiochip_register(struct udevice *parent)
{
struct uclass_driver *drv;
struct udevice *dev;
int ret;
ofnode node;
drv = lists_uclass_lookup(UCLASS_GPIO);
if (!drv)
return -ENOENT;
dev_for_each_subnode(node, parent)
if (ofnode_read_bool(node, "gpio-controller")) {
ret = 0;
break;
}
if (ret)
return ret;
ret = device_bind_with_driver_data(parent, &mtk_gpio_driver,
"mediatek_gpio", 0, node,
&dev);
if (ret)
return ret;
return 0;
}
int mtk_pinctrl_common_probe(struct udevice *dev,
struct mtk_pinctrl_soc *soc)
{
struct mtk_pinctrl_priv *priv = dev_get_priv(dev);
int ret;
priv->base = dev_read_addr_ptr(dev);
if (!priv->base)
return -EINVAL;
priv->soc = soc;
ret = mtk_gpiochip_register(dev);
if (ret)
return ret;
return 0;
}